Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • abbreviation astronomical unit

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The ISO 3166-1 two-letter (alpha-2) code for Australia.
  • noun astronomy Initialism of astronomical unit.
  • noun Initialism of angstrom unit.
  • noun Initialism of alternate universe.
  • proper noun Initialism of African Union.

Etymologies

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